Mitsubishi Electric 800 Series Instruction Manual page 164

• The following charts show operations when a communication option fault occurs.
Pr.502 = "0 (initial value)"
Fault occurrence
OFF
Fault
Fault display
(E.1)
Fault output
OFF
(ALM)
Alarm output
OFF
(LF)
Pr.502 = "6"
Fault occurrence
OFF
Fault
Warning
display
(CF)
Fault output
OFF
(ALM)
Alarm output
OFF
(LF)
NOTE
• When a communication option is used, the protective function [E.OP1 (fault data: HA1)] is activated at error occurrences on
the communication line. The protective function [E.1 (fault data: HF1)] is activated at error occurrences in the communication
circuit inside the option.
• Fault output indicates the Fault (ALM) signal and an alarm bit output.
• When the fault output is set enabled, fault records are stored in the fault history. (A fault record is written to the fault history at
a fault output.)
• When the fault output is not enabled, a fault record is overwritten to the fault history temporarily but not stored.
• After the fault is removed, the fault indication goes back to normal indication on the monitor, and the fault history goes back to
the previous status.
• When Pr.502 = "1 or 2", the normal deceleration time setting (settings like Pr.8, Pr.44, and Pr.45) is applied as the deceleration
time.
• If a communication line error occurs, then the error is removed during deceleration while Pr.502 = "2", the motor re-accelerates
from that point. The operation command and the speed command before the fault occurred will be applied for restarting. The
normal acceleration time setting (such as Pr.7/Pr.44 setting) is applied for restart. (Acceleration does not restart when a
communication option fault occurs.)
• The Pr.502 and Pr.779 settings are valid when communication is performed via the PU connector, Ethernet connector, or a
communication option.
• These parameters are valid under the Network operation mode. When performing communication through the PU connector,
set Pr.551 PU mode operation command source selection ≠ "2".
• Pr.502 is valid for the device that has the command source under the Network operation mode. When an error occurs for
communication through the PU connector or the Ethernet connector while Pr.550 = "9999 (initial value)" and a communication
option is installed, Pr.502 becomes invalid.
• If the communication error setting is disabled with Pr.121 = "9999" or Pr.122 = "9999" while Pr.502 = "6", the inverter does not
operate with the frequency set in Pr.779 when a communication error occurs.
Fault removal
ON OFF
Motor coasting
Time
Display
ON
Fault removal
ON OFF
Pr.779 = "9999" Pr.779 = "9999" Pr.779 = "9999"
Pr.779 ≠"9999"
(Runs at the frequency setting of Pr.779)
Time
Display
ON
Pr.502 = "1 or 2"
Fault occurrence
OFF
Fault
Fault display
(E.1)
Fault output
OFF
(ALM)
Alarm output
OFF
(LF)
Pr.779
Fault removal
ON OFF
Decelerates to stop
Time
Display
ON
5. Common Settings
1
2
3
4
5
6
7
8
9
10
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